In testimony before Congress, letters to the federal government and press releases, Navajo Nation President Russell Begaye and his vice president have brought up recent tragedies that have shaken some reservation towns to their cores.
They said eight people killed themselves in communities impacted by the unleashing of toxic waste from a Colorado gold mine into the San Juan River on the Navajo Nation, burdened by the stress of seeing a sacred waterway polluted.

"When you're being abandoned in your great time of need, what do you do? It causes great amount of distress," Begaye said at a recent Senate Indian Affairs Committee hearing where he pleaded for more resources from the federal government over the spill.

If you think people are killing themselves because a "sacred" river is polluted, then I question the social worker credentials you pulled in the other thread. Several other reasons I can think off right off the top of my head that doesn't include pollution.